Index in MYSQL on text field

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Advice title: Index in MYSQL on text field

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Advice description:

After getting of message:
Error 'BLOB column 'nazwa_kolumny' used in key specification without a key length
You should do:
1. how many chars are minig for us?okreslic ile znaczkow jest dla Nas znaczacych tej kolumny tekstowej
2. Do:
CREATE INDEX name_of_index ON table_name(filed(size_from point_1))

That's all folks - now it can be faster (select) about 100 times

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